[PATCH v5] Add AMD znver6 processor support

[Jan Beulich]

On 24.11.2025 16:35, Umesh Kalvakuntla wrote:
>> Assuming this will (eventually) need applying on your behalf, 
> Yes.
> 
>> can we  get a git-am-able form of the patch, though? The above has extra 
>> indentation, which I'm not sure "git am" would properly strip.
> Generated now with git format-patch.
> 
>> You will want to alter operands such that the ModR/M byte ends up as a
>> single-byte opcode, such that the disassembler will properly recognize
>> the insn boundary ahead of the 2nd insn under test.
> Added .fill directive following other examples. Now both are
> disassembled as invalid. 

But why? .fill adds volume and noise, and hence it or alike should be used
only as a last resort. I did explain what you want to do to avoid the need
for .fill.

You didn't address the CpuUnused aspect though. That's fine given the plan
we look to have agreed on, but such an aspect still needs pointing out.
For example, to make sure someone other than Haochen or me ending up
committing this patch (once a final okay way given) wouldn't break things
unknowingly.

> --- a/gas/doc/c-i386.texi
> +++ b/gas/doc/c-i386.texi
> @@ -126,6 +126,7 @@ processor names are recognized:
>  @code{znver3},
>  @code{znver4},
>  @code{znver5},
> +@code{znver6},

Noticing only now: Unlike this one, ...

>  @code{btver1},
>  @code{btver2},
>  @code{generic32} and
> @@ -198,6 +199,7 @@ accept various extension mnemonics.  For example,
>  @code{avx512_bf16},
>  @code{avx_vnni},
>  @code{avx512_fp16},
> +@code{avx512_bmm},

... this doesn't have a counterpart ...

> @@ -1691,9 +1693,9 @@ supported on the CPU specified.  The choices for @var{cpu_type} are:
>  @item @samp{k6} @tab @samp{k6_2} @tab @samp{athlon} @tab @samp{k8}
>  @item @samp{amdfam10} @tab @samp{bdver1} @tab @samp{bdver2} @tab @samp{bdver3}
>  @item @samp{bdver4} @tab @samp{znver1} @tab @samp{znver2} @tab @samp{znver3}
> -@item @samp{znver4} @tab @samp{znver5} @tab @samp{btver1} @tab @samp{btver2}
> -@item @samp{generic32}
> -@item @samp{generic64} @tab @samp{.cmov} @tab @samp{.fxsr} @tab @samp{.mmx}
> +@item @samp{znver4} @tab @samp{znver5} @tab @samp{znver6} @tab @samp{btver1}
> +@item @samp{btver2} @tab @samp{generic32} @tab @samp{generic64}
> +@item @samp{.cmov} @tab @samp{.fxsr} @tab @samp{.mmx}

... down below here.

Jan